Tire.



E. KEMPSHALL.

TIRE. PPLIOATION FILED HAB.I30, 1908.

908,275, Patented m29, 1908.

Fea

ELEAZER KEMPSHALL,

OF LONDON, ENGLAND.

TIRE.

Specification of Letters Patent.

atented Dee. 29, SOS.

Application med March 39, 1908. Serial No. @63216.

Toall 'whom it 'may concern: j

Be it known that l, Ernfiznn KniiPsHiiLL, a citizen of th'e United States of America, and residing at- Hotel Russell, IRussell Square, London, TV. C., England, have invented certain new and useful improvements in Tires, of which the following is a speci tication.

This invention relates to non skid tires which are provided with circular recesses in the tread to act as suction-chambers.

The object of the present invent-ion is to retain the advantages of these recesses while avoiding weakening of the tire at the parts immediately below the recesses, and the in,- yention 'consists essentially in forming conical dome-shaped or like protuberances on the bottom of the recesses, thereby considerably increasing the thickness of the tire at these portions while still leaving suilicient space in the recesses to enable the latter to act eliiciently as suction chambers.

ln the accompanying drawings Figures Il and 2 are respectively a cross section'and a plan oi" a portion of a. tire according to one form of the invention, Figs. 3 and l being similar views of a portion of a tire according to another form. Fig. 5 is a 'side ele\ ation corresponding` to Fig. 4f.

'In carrying out the invention according to one inode a pneumatic tire, a, is provided with projecting studs, I), ot' approximately circular t'oi'm and 'merging into one another so as to form a continuous tread and one the plane of which is practically tlat when in contact with the road. Each stud, bfis formed with a circular recess, c, which acts as a suction chamber when the stud is in Contact with the road surface andavoids side slip or shielding. It' therecesses were formed with fiat bottoms the thickness of the tire at the portions, d, is so reduced as to lrender the tire weak at these parts.- In vorder to adequately strengthen these portions and yet to retain sutlicient space in the recesses so as' not to reduce the efficiency of the recesses when acting as suction chambers, a protuberance c is formed in each recess. The jjirotuberance also vthe ejection of mud. This protiiberance may be et conical forni as in Figs, l and :2, of dome shape as in Figs. 3 and il or of any other similar shape. T he ,',irot-ub'erances c' may be molded integral with the tire. ll'ieir apexes are preferably [lush with the tread but they may be lower than the latter.

Having thus described my invention what I claini as ne and desire to secure by Let-- ters Patent l. Si tire having a. body portion provided on its tread with a rib torn'ic'd with a series of recesses, the tace of the tread between the edges ol the recesses and the vedges of the ribs being substantially fiat to resist downward pressure of the tire, the outer walls of the rib being ot irregular formation and the twalls of the recesses being substantially parailel, the bottoms ot' the recesses having projections formed with the body portion to reinforce said body portion ot the tire at the points where the recesses are formed.

:2. A tire having a body portion provided with a rib on its tread, said rib having recesses sonic distance from the edge of the rib to provide a substantially flat tread surface said rib being narrower than the body porf tion, the bottoms ot the recesses having projections formed with'the body portion and extending to a point on a line with the upper edges of the ribs the outer faces of the probottom of the recesses, said projections reinforcing the body portion ot" the tire at the points where the, recesses are formed.

Tn testimony vwhereof l have signed my naine to this specrtication in the presence of two subscribing witnesses.

ELEAZER KEMPSHALL.

VVitnes," l t A. liiArnrs, ALnniz'r E. PARKER.

jcctions being rounded, and their bottoms cesscs being parallel, and projections in the 

